Fuel injection nozzle
AssigneeRobert Bosch GmbH
InventorKlaus Dobler
Life of this patent
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Abstract
A fuel injection nozzle having a built-in transducer for detecting the onset of injection or the duration of injection by means of a signal. The transducer is dimensioned so as to be housed in the nozzle holder without altering the external shape of the injection nozzle. The transducer may be a Hall transducer or a field-dependent resistor probe.
Claims11
A fuel injection nozzle for internal combustion engines comprising a spring-loaded valve needle for regulating the onset of fuel injection, a spring retainer means, a Hall transducer for indicating the onset of the fuel injection and/or the length of the fuel injection, said Hall transducer including a stationary Hall chip secured within and surrounded by said spring retainer means, and a permanent magnet, the magnetic influence on the Hall chip of said permanent magnet changing with the stroke of the valve needle, characterized in that said permanent magnet is disposed in a position not hindering the stroke of the valve needle.
A fuel injection nozzle for internal combustion engines comprising a spring-loaded valve needle for regulating the onset of fuel injection, a Hall transducer for indicating the onset of the fuel injection and/or the length of the fuel injection, said Hall transducer including a stationary Hall chip and a permanent magnet, the magnetic influence on the Hall chip of said permanent magnet changing with the stroke of the valve needle, characterized in that said permanent magnet is stationarily disposed in a position not hindering the stroke of the valve needle, and a magnetizable magnetic field interrupter made of a magnetizable material coupled with said valve needle, said interrupter covering variable sized areas of said Hall chip in the end positions of said valve needle in relationship with the permanent magnet.
Dependencies are inferred from the claim text.